Understanding dendritic integration in relation to its excitatory and inhibitory inputs is critical to deciphering neuronal data processing. Upon sensorimotor stimulus, the cerebellar Purkinje neuron (PN) receives excitatory inputs from a single climbing fiber (CF), thousands of parallel fibers (PFs), and feed-forward inhibitory inputs (FFI) from molecular layer interneurons (MLIs). This study aims to understand the dendritic interplay of MLI inhibitory inputs, shaping excitatory inputs upon air puff stimulation in awake mice.We labeled MLI axons with GCaMP6 and PN with the voltage-sensitive dye ANNINE-6plus (and also with iGluSnFR, iGABASnFR), and simultaneously imaged presynaptic calcium activity and postsynaptic voltage modulation of the PN dendrite and soma with 2P microscopy at millisecond temporal resolution. At rest, the axonal calcium activity of MLI was weakly modulated while the PN dendritic voltage showed complex spikes and weak fluctuations of membrane potential.The dendritic complex spike (DCS) showed a constant voltage amplitude over distance from soma at rest, however, during a sensory stimulus the DCS amplitude increased with distance from soma. Additionally, in response to a sensory stimulus, the MLI axons show long-lasting calcium transients (4.5s for a 50ms stimulus). MLI calcium transients in distal dendrite start with a delay of 10-50 ms while the delay was only about 10 ms at a distance of 20 um from the soma.Summarizing, this study indicates that during sensory motor stimulation PF inputs facilitate DCS backpropagation while MLI sharply curtails a time window for coincidence detection time in the distal dendrite.